MS15-034 - Remote code execution via HTTP request in IIS on Windows

Symptoms

A remote code execution vulnerability exists in the HTTP protocol stack (HTTP.sys) that is caused when HTTP.sys improperly parses specially crafted HTTP requests. An attacker who successfully exploited this vulnerability could execute arbitrary code in the context of the System account.

To exploit this vulnerability, an attacker would have to send a specially crafted HTTP request to the affected system. The update addresses the vulnerability by modifying how the Windows HTTP stack handles requests.

Request is using the Range-header to trigger a buffer overflow and detect if the system is vulnerable or not. When sending such a request, it can trigger a blue screen on the Windows Server, effectively rendering it offline.